Galena has teen obtained here in small specimens, as well as several ores of copper ; one specimen of the latter yielding from 50 to 75 per cent, also iron pyrites, Sulphuret of zinc and oxide of manganese occasionally occur in the lime stone rock. "Sing Sing is also celebrated for its marble quarries, which are worked to a great extent by the state prison convicts, who have here erected two large prisons, a keeper's house and several ranges of work -shops from materials found on the state farm." The mar-

*■ From the original map in the possession of the Hon. William Jay, Bedford.

COUNTY OF WESTCHESTER. 505

ble found in this vicinity, is the dolomitic or white coarsegrained, of excellent quality, and almost inexhaustible ; large quantities are annually quarried and sent to the city of New Yojk and other plac s.

"The Mount Pleasant Stale Prison, situated about half a mile south of the village of Sing Sing, and thirty-three miles no th of New York ; contained in 1840, 847 male and female convicts, of whom 60 were fema'es.

The prison grounds consist of 130 acres of land, lying between the villages of Sing Sing and Sparta ; being bounded on the east by the Highland turnpike, and on the west by the Hudson river, which here affords a depth of twelve feet of water at the landing. The main prison building is four hundred and eighty-four feet in length, running north and south, and forty-four feet in width, fronting westerly on the Hudson, being five stories in height, and containing one thousand cells ; in front and rear are located work shops of different kinds, which together with the keeper's house are all built of rough dressed marble. Attached to the prison building on the south, is a chapel, hospital, kitchen, store houses) &.C.